Hi Natchez,
To clean an engine internal parts, you need to disassemble it to do a good job. All those flushing jobs would not do a good job of cleaning and this might cause more harm than good.
A good engine oil would bring out the sludge from the engine during oil changes and oil treatment are the main cause for deposits.
I would suggest not doing anything unless you want to do a rebuild job.
Friday, October 31st, 2008 AT 3:33 PM